Vent system problems

I just bought a 1992 Nissan Maxima....my first...WOW what power; sure is fun to drive!!!

One question:

When heat is selected to blow from the floor vents, cold air is blown out of front and defrost vents; not comfortable on a long trip. When front vents are selected, hot air is blown out of drivers vent only; passenger vents blow out cold air with air is also coming out of the defrost vents.

Last owner said that dealer told him just to close all the front vents when you want heat...did not make much sense to me..

Please help.....

Thank you for your help

92max

There is a switch that goes up and down that is on the left side of your A/C button. Turn the switch down. Then, press the button on the right side from the A/C button, that will stop outside air from coming into the cab. This method will allow you to get the maximum from your A/C and heater!! Good Luck!!